I've applied armour enhancements to sailek's armour (the special forces one and another rare/epic) and want to now take them off and apply them to the armour that Deathmold gave me before going into the mist. I think I'm at a loss here but I just thought I'd ask :)

No, you can not.

But you can craft some really neat Diamond Armor Reinforcements.

Yeah, the only options is to either buy them, find them aloong the way, or craft them. Once installed, they are there to stay. I have found myself in the same situation with the Dwarven Armor Enhancement. I installed it on one armor, than got some much better armor later that I wished I had had it to install.